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Usually, contrails smear out and fade away. However, when atmospheric conditions are just right (the ice crystals that make up the contrails stay relatively in place due to proper temps or lack of high winds at their level), they will spread out widely (yes, up to tens of miles) and just hang there...
They're just artificial clouds, after all...
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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